Suppressed R15 Dirty Brass


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jbeltz7
August 14, 2011, 03:24 PM
Shooting my Gemtech equiped Bushmaster yesterday for the first time I was using brand new 55 grain FMJ Remington/Federal ammo and after being fired the brass was filthy. I have never seen once-fired brass so covered with black powder residue, the outside of the cartridge case was almost the same color as the inside. Is the extra gas blow-back is causing the issue or is this common for the AR or do I possibly have a problem with this rifle? TIA

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Jason_G
August 14, 2011, 03:46 PM
Is the extra gas blow-back is causing the issue or is this common for the AR

Don't own an AR or a suppressor, but I'd say it's normal, and a product of DI. That crap's got to go somewhere. Someone please feel free to correct me if I'm wrong.

Jason

W.E.G.
August 14, 2011, 04:42 PM
Normal with my Gemtech/AR

Face full of gas too.

I'll venture the gee-whiz piston-driven AR's filthy the brass too.
95% of the crap coming back in a suppressor gun is coming down the bore - not through the gas tube.

Jason_G
August 14, 2011, 10:07 PM
95% of the crap coming back in a suppressor gun is coming down the bore - not through the gas tube.

Yeah, I guess you're right. I guess the only reason I noticed it with ARs and not with other rifles is because, like you said, it's coming back into the shooter's face through the charging handle opening.

JustinJ
August 16, 2011, 04:49 PM
Running a can on my ARs, sig 556 and MSAR causes the same dirty case effect.

Interestingly I have a USC to UMP conversion with a 16" barrel (for the time being) that does the same thing to .45 brass.

Zak Smith
August 16, 2011, 05:36 PM
Fire about 10 rounds, then leave one in the chamber for 10 seconds, then eject it. The unfired cartridge will be filthy from the gas pushed back up the bore.

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